Curse of Nightmares

With this ritual, you visit a creature with screaming night terrors.

While reciting the secret words of this ritual, you boil a quantity of fine red wine in a copper caldron and, at the appropriate point in the ritual, stir in the hair, skin, nail, or scale of the target creature. When the ritual is complete, your mixture vanishes in a flash of steam, and the target must succeed on a Wisdom saving throw or suffer your curse. If the target is sleeping when your ritual is completed, it makes the saving throw with disadvantage.

A cursed creature experiences nightmares or terrifying hallucinations whenever it attempts to rest and is unable to benefit from a short or long rest until the curse is removed by remove curse or more powerful magic. A creature cursed in this way gains 1 level of exhaustion for each day the curse remains in effect.

If you attempt to cast this spell on a creature with an Intelligence score of 7 or lower or upon a creature on a different plane of existence from you, the spell fails.